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A fun, free platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
What a Curve! (Breizh CTF) CTF Archive 0
GLP420 (HackTM CTF) CTF Archive 0
unrandom DSA (HackTM CTF) CTF Archive 0
kaitenzushi (HackTM CTF) CTF Archive 0
d-phi-enc (HackTM CTF) CTF Archive 0
Weekly Top Users
#1 Mikbrosim 3875
#2 Phaazhzhasse 2735
#3 jsack 1985
#4 Matinc26 1795
#5 repierre 1690
Recent Solves
ASCII Maddoxx
You either know, XOR you don't Lalourche
Great Snakes Maddoxx
Base64 Shaggy_404
ASCII Dambel
Recent Solutions
XOR Properties dovmoo 0
ECB Oracle skriptr 0
Beatboxer wang606 0
Extended GCD thebug 0
Greatest Common Divisor thebug 0

Level Up

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